ZDNet reports that Microsoft will release a preview of Windows 9, next month, in advance of of the general release, which is expected in Spring 2015. Which of the the rumored improvements will Microsoft show off in the early preview?

So far we've heard a number of rumors about what Windows 9 might have in store, including everything from baked-in Cortana, to a mini start menu, to a new UI that completely ditches charms. Obviously the report is just a rumor at this point, but it makes sense: Windows 8 was first previewed in September 2011. [ZDNet]